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Hi did you solve this problem I am having the same issue?

Did the Crown Vic rear diff fit right in? Im having a similar issue and need to replace the entire diff due to a bent housing. Cant find a limo/hearse diff anywhere. But there are plenty of CV diff around

I had the same problem with a marinized Kubota 2 cylinder z500. Have been working on the injection timing for weeks. Put in new pistons, rings, bearings, and rebuilt injection pump. When doing the timing I was basing the firing timing on when a bulge of fuel is visible but the correct approach, according to the manual, is to set the throttle to full, make sure its bled, then look for "the first sign of fuel movement". When I dried the injection pump port with the tip of a paper towel and looked for the first sign of fuel movement the timing mark got closer. I added another shim to make a total of 4 shims and she was timed perfect. Summary - set the decompression lever, dry the port, then rotate really slowly, there is a several degree difference between "first sign of movement" and the fuel bulge you see people talking about in this and other few videos out there. Hope this helps.

Very interesting ! It's the only video on TH-cam which explain the Kubota timing injection pump

D850 falinger nambar

Apparently there as some very thin shims that are prone to sticking to the mating surface between the pump and housing...I believe they are used to adjust timing.

reduce shim thickness in that inj. to get it to fire sooner?

Yeah you could be off when you put the motor together originally I wouldn’t know but I do know that I never went off the fly wheel for any markings I just took everything on the front line every mark on the front gears and always had good luck.